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An implicit differentiation problem

Find $\frac{d^2y}{dx^2}$ for:

$$x^4+y^4=16$$

This can be kind of difficult, but calculus thinking and some differentiation techniques can get us an answer a bit more easily. Check out the discussion and solution here.

A great use of implicit differentiation: easy slopes of tangents

Change this one thing about how you solve absolute value problems!